A Palestinian boy cover his head with a plastic sheet on a rainy day in Khan Younis in the southern Gaza Strip February 22, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

A Palestinian woman holds her child as she walks at Khan Younis refugee camp on a rainy day in the southern Gaza Strip February 22, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

A Palestinian girl carries cabbage as she returns to her family's house from a market, on a rainy day in Khan Younis in the southern Gaza Strip February 22, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

A Palestinian boy holds his sister as he walks in an alley at Khan Younis refugee camp on a rainy day in the southern Gaza Strip February 22, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

A Palestinian woman stands with her children outside their house on a rainy day in Khan Younis in the southern Gaza Strip February 22, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

Palestinian woman Jihan Abu Muhsen rides her donkey-drawn cart as she makes her way to unload bricks that she collected for sale from the sites of demolished buildings in Khan Younis in the southern Gaza Strip March 8, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

Palestinian woman Jihan Abu Muhsen prepares her donkey with her son Kareem before going work collecting bricks for sale from sites of demolished buildings, at her dwelling in Khan Younis in the southern Gaza Strip March 8, 2016. Abu Muhsen gathers bricks from the sites of demolished buildings and sells them to recycling factories. She earns around 20 shekels ($5) a day and her 10-year-old son Mohammad helps her when he is not at school. (Photo by Ibraheem Abu Mustafa/Reuters)

Palestinian students take cover from rain outside their school in Khan Younis in the southern Gaza Strip March 28, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

A Palestinian collects water from a well in Khirbet Tana near the West Bank city of Nablus March 29, 2016. (Photo by Abed Omar Qusini/Reuters)

A Palestinian man rides his horse past the remains of a school that was funded by the European Commission Humanitarian Aid and Civil Protection (ECHO) and was demolished by Israeli forces, in Khirbet Tana near the West Bank city of Nablus March 29, 2016. (Photo by Abed Omar Qusini/Reuters)

A Palestinian performs stunts during a cultural carnival organized by Gaza Municipality in Gaza City April 1, 2016. (Photo by Mohammed Salem/Reuters)

A Palestinian performs stunts during a cultural carnival organized by Gaza Municipality in Gaza City April 1, 2016. (Photo by Mohammed Salem/Reuters)

Palestinian Mohammad Baraka, nicknamed Gaza Samson, pulls a bulldozer by a rope tried around his waist as he holds a man dressed as a clown during a cultural carnival organized by Gaza Municipality in Gaza City April 1, 2016. (Photo by Mohammed Salem/Reuters)

Palestinians climb over a tree as they watch a cultural carnival organized by Gaza Municipality in Gaza City April 1, 2016. (Photo by Mohammed Salem/Reuters)

Palestinian fishermen use a net to catch fish on a beach in Gaza City April 3, 2016. Israel on Sunday extended the distance it permits Gaza fishermen to head out to sea along certain parts of the coastline of the enclave, which is run by the Islamist group Hamas. (Photo by Ibraheem Abu Mustafa/Reuters)

A Palestinian man sits on a wrecked car as fishermen ride a boat in the Mediterranean Sea off the coast of Gaza City April 3, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

Palestinian fishermen take fish out of their net on a beach in Gaza City April 3, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)

Palestinian Mohamad Abu Thabet collects anemone coronaria flowers with his children at a field in the West Bank village of Beit Dajan near Nablus, April 5, 2016. (Photo by Abed Omar Qusini/Reuters)

Palestinian woman Nasra Abo Hammad, 75, makes straw trays for sale at her home in West Bank village of Kifl Hares, south of Nablus April 11, 2016. (Photo by Abed Omar Qusini/Reuters)